\begin{tikzpicture}
\node[anchor=south west,align=center,package,minimum height=1cm,fill=white] (node0) at (3.5,0.5) {\M{PRF}};\draw[-latex,rounded corners] (2,1) -- node[onarrow] {\O{NewKey}\\\O{Eval}\\\O{Hon}} (3.5,1);
\end{tikzpicture}
